Mont-rebei Gorge Nature · Àger, Noguera, Lleida Gorge through which the river Noguera Ribagorçana crosses the Montsec range, at the narrowest point of its course, forming part of the Noguera Ribagorçana-Mont-rebei Partial Nature Reserve, on the border between Aragon and Catalonia. On its southeastern side it belongs to the municipality of Àger, in la Noguera; on the northeastern side, to that of Sant Esteve de la Sarga, in the Pallars Jussà; and on the western side, to that of Viacamp i Lliterà, in the Aragonese Lower Ribagorza. It is a place of great ecological value, with abundant birds of prey, and much appreciated by climbers and cavers for its cliffs and caves, such as that of la Colomera; its conservation is entrusted to the Fundació Catalunya-La Pedrera. Photo: Mikipons (CC BY-SA 3.0) What to see and do in Àger